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As a pop-eyed goldfish fishman, Gyaro has beige skin and black hair in ponytail. He has incredibly large eye sockets but incredibly small eyes. He has a long jaw with large lips and a small mouth. He wears a normal t-shirt and pants. He has his Sun Pirates tattoo on his left bicep.

Unlike Macro, Gyaro does not appear to be very bright. Also, unlike most other fishmen seen in the series, he and the rest of the Macro Pirates have no qualms selling other fishmen and merfolk to slavery.

Gyaro was seen amongst the Sun Pirates. During their time roaming the seas, the Sun Pirates battled Marines numerous times. One day a former human slave named Koala boarded their ship to return to her home in Foolshout Island. During her time with the Sun Pirates, Gyaro, Macro, and Tansui got attached to the girl. When she finally returned to her home, the three fishmen emotionally cried during her farewell. After Koala returned to her family, the Sun Pirates were ambushed by the Marines. They lost their ship and Tiger was badly wounded during the battle. Tiger soon died from his wounds and Arlong was later captured. Gyaro was then under the command of Jinbe. After Jinbe's acceptance into the Shichibukai and Arlong's release, Macro, Gyaro, and Tansui left the Sun Pirates and became their own crew.

While going out for walk on the sea floor with his men, Gyaro and the crew met up with Hatchan. Seeing that a mermaid was with him, the Macro Pirates decided to trade a treasure map with Hatchan for the mermaid, Keimi. The offer was happily accepted as Macro explained to Hatchan that it would lead the octopus fishman to the long sought after legendary Takoyaki sauce. While the map Macro gave was legit, the crew's real intention for Keimi was to sell her off as a slave.

Having acquired the mermaid, the gang decided to sell her off. They unfortunately did not get very far when Hatchan suddenly attacked their ship and beat them up. Hatchan apparently came back to beat them because he thought that he was cheated upon by them. The map that they gave him appeared to be a fake to Hatchan since it lead him to a giant squid instead of the sauce he sought after. Macro however explained as he was beat up that they did not cheat him. While the map did lead to a giant squid, it did indeed lead to the sauce as the sauce was inside the giant squid. With that, the gang were spared from further injury. Unfortunately, their prized mermaid slave was freed in the midst of Hatchan's attack and decided to follow him.

Having lost their prize, Gyaro and the other Macro Pirates decided to try to get Keimi back in their clutches and get their revenge against Hatchan.

Since their initial defeat at the hands of Hatchan, the crew had been trying to recapture Keimi. They would succeed at capturing her at every attempt but every time they would also be foiled by Hatchan, who had since befriended Keimi and would beat them up. Gyaro and the crew continued with these scenario until after the thirtieth time, they decided to get some help.

The crew decided to ally themselves with the Flying Fish Riders. With kidnapping gang's help, they were able to beat up and capture Hatchan. With him in their clutches, the Macro Pirates not only planned to capture Keimi when she came to rescue him at the Flying Fish Riders' base, but also planned to sell off his former crew mate as a slave since octopus fishmen fetched a high price in the slave market. After letting Keimi knew what had happened to her friend via Den Den Mushi, Gyaro and the crew found out that she was bringing along with her to base the Straw Hat Pirates. Amongst the Straw Hats was someone that the Macro Pirates' new-found ally, Duval, was looking for. Upon telling Duval of the new turn of the events, he thanked them for their great contribution despite the disrespect Gyaro showed to him.

With a plan to ambush the Straw Hats and Keimi alongside the Flying Fish Riders, the Macro Pirates hid deep underwater below the base. Sure enough, their plan to capture Keimi once again work as she dove into their clutches in an attempt to save an imprisoned Hatchan. Unfortunately, she was once again rescued as Luffy grabbed her out of their hands. In the midst of the battle between the Straw Hats and the Flying Fish Riders that soon followed, Gyaro and the crew were once again defeated by Hatchan, who punched the Macro Pirates, sending them flying away from the base.